Registration Dossier

Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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Description of key information

The 21-day NOEC based on survival, growth and reproduction was ≥14.3 µg Pd L-1, the highest concentration tested.

Key value for chemical safety assessment

Additional information

Available ecotoxicity data for palladium substances indicates that palladium substances with a chloro ligand are more toxic than those without a chloro ligand. For palladium a single, worst case PNEC value has been derived for each environmental compartment, to cover all palladium substances. The PNEC has been derived based on the most toxic palladium substance, diamminedichloropalladium. Therefore, although toxicity results for diamminedicloropalladium are likely to overestimate the toxicity of palladium substances that do not contain a chloro ligand, this data is included in the dossiers for all palladium substance as it was taken into account in PNEC derivation. ADaphnia magnareproduction study conducted with diamminedichloropalladium is available carried out according to OECD guideline 211 (Simon 2014). A semi-static study was conducted, with test solutions renewed three times a week. Fresh and aged test solutions were analysed, and results were based on the time weighted average of mean measured initial and mean measured aged concentrations. In the period before renewal palladium concentrations in the test solutions decreased considerably, to 3 – 65% of nominal at the five highest test concentrations. The 21-day NOEC based on survival, growth and reproduction was ≥14.3 µg Pd L-1, the highest concentration tested.